The transcript of this letter is not available online on Ɛpsilon.
Please cite as “Herschel6685,” in Ɛpsilon: The Sir John Herschel Collection accessed on 20 April 2024, https://epsilon.ac.uk/view/herschel/letters/Herschel6685
Has not had time until now to carry out experiments on 'the central spot' as seen in photographs as related in JH's last letter. His recent trials with various lenses have verified JH's theories.
Record created for the Calendar of the Correspondence of Sir John Herschel (CUP: Cambridge), 1998 by Michael J. Crowe ed., David R. Dyck and James J. Kevin assoc. eds
Digital record created by Dr Marvin Bolt and Steven Lucy at the Webster Institute of the Adler Planetarium
Converted to TEI by Michael Hawkins, Epsilon Project, Cambridge University Library
John Herschel Project[View Ɛpsilon collection]